Hi, I've a Mesa Nomad Head 100. After 1h of playing the amp started to make a noise (like a ship, a sort of "whoooooooom") and I switched off the standby getting a "pop" even if the volume was set to 0.I tryied to turn on again but the sound was back again.. then I watched behind and saw two tubes that were a kind of overheated. I though that were broke tubes and changed with another quartet that I have. Nothing, the first two positions from left get overheated.What it can be? I made a video so You can see what happens.Cannot play with this (I don't want to broke more..) and there's the whoooom that makes problems.Amp got nothing mods (except mud mod, serial-parallel mod and reverb mod), didn't get shock or rain etc.It had a problem with pilot light solved (it was a path broken).

I didn't used it from 2 weeks but it was in my bedroom.. and I used it 1h today without problems. It was perfect.This is the video..

The blue glow is in all 4 tubes but now the first 2 from left get so hot and got a very high blue glow after turned on.. If I switch tubes the problem remains in the same position. They get so hot and starts a sound with "whooooooooooooom".. I can't power up the amp.. I'll check a tech..